Update to 2.0.0 tree from current Fremantle build

[opencv] / 3rdparty / lapack / drot.c

diff --git a/3rdparty/lapack/drot.c b/3rdparty/lapack/drot.c
new file mode 100644 (file)
index 0000000..50b1ab1
--- /dev/null
+++ b/3rdparty/lapack/drot.c
@@ -0,0 +1,73 @@
+#include "clapack.h"
+
+/* Subroutine */ int drot_(integer *n, doublereal *dx, integer *incx, 
+       doublereal *dy, integer *incy, doublereal *c__, doublereal *s)
+{
+    /* System generated locals */
+    integer i__1;
+
+    /* Local variables */
+    integer i__, ix, iy;
+    doublereal dtemp;
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+/*     .. Array Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*     applies a plane rotation. */
+/*     jack dongarra, linpack, 3/11/78. */
+/*     modified 12/3/93, array(1) declarations changed to array(*) */
+
+
+/*     .. Local Scalars .. */
+/*     .. */
+    /* Parameter adjustments */
+    --dy;
+    --dx;
+
+    /* Function Body */
+    if (*n <= 0) {
+       return 0;
+    }
+    if (*incx == 1 && *incy == 1) {
+       goto L20;
+    }
+
+/*       code for unequal increments or equal increments not equal */
+/*         to 1 */
+
+    ix = 1;
+    iy = 1;
+    if (*incx < 0) {
+       ix = (-(*n) + 1) * *incx + 1;
+    }
+    if (*incy < 0) {
+       iy = (-(*n) + 1) * *incy + 1;
+    }
+    i__1 = *n;
+    for (i__ = 1; i__ <= i__1; ++i__) {
+       dtemp = *c__ * dx[ix] + *s * dy[iy];
+       dy[iy] = *c__ * dy[iy] - *s * dx[ix];
+       dx[ix] = dtemp;
+       ix += *incx;
+       iy += *incy;
+/* L10: */
+    }
+    return 0;
+
+/*       code for both increments equal to 1 */
+
+L20:
+    i__1 = *n;
+    for (i__ = 1; i__ <= i__1; ++i__) {
+       dtemp = *c__ * dx[i__] + *s * dy[i__];
+       dy[i__] = *c__ * dy[i__] - *s * dx[i__];
+       dx[i__] = dtemp;
+/* L30: */
+    }
+    return 0;
+} /* drot_ */